CN113533412A - Sub-rapid solidification-control cooling-control high-flux thermal simulation testing machine and testing method - Google Patents
Sub-rapid solidification-control cooling-control high-flux thermal simulation testing machine and testing method Download PDFInfo
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Abstract
The invention discloses a sub-rapid solidification-control cooling-control high-flux heat simulation testing machine which comprises a moving device, a heating device, a metal melting pool, a cooling device, a plurality of samplers and a plurality of first lifting mechanisms which are equal to the number of the samplers and correspond to the samplers one by one, wherein the metal melting pool is arranged on the inner side of the heating device, the cooling device is arranged on the metal melting pool, a plurality of cooling liquid barrels with openings at the upper ends, which are equal to the number of the samplers and correspond to the samplers one by one, are arranged on the cooling device, the samplers are in transmission connection with the moving device through the corresponding first lifting mechanisms, and the moving device can drive the samplers to move back and forth between the metal melting pool and the corresponding cooling liquid barrels. The invention provides a sub-rapid solidification-control cooling-control high-flux heat simulation testing machine and a testing method, which are combined with a ProCAST simulation temperature field to realize that the cooling conditions of a solidification process and a quenching process are simultaneously controlled in a laboratory simulation twin-roll thin strip continuous casting process so as to obtain an expected room temperature structure.
Description
Technical Field
The present invention relates to liquid-solid transformation of molten steel and solid-state transformation after solidification. More specifically, the invention relates to a sub-rapid solidification-control cooling-control high-flux thermal simulation testing machine and a testing method.
Background
The twin-roll thin strip continuous casting technology is a leading-edge technology in the field of metallurgy and materials, and is a revolutionary change in the steel industry. The process principle is as follows: molten steel is directly poured between a pair of crystallization rollers which rotate in opposite directions and are internally cooled by water, and the molten steel is poured into the crystallization rollers at 10 DEG2～103And rapidly cooling at a cooling rate of 1℃/s to form a blank shell, and producing the thin strip steel with the thickness of 1-5 mm.
Compared with the production process of thin steel in the traditional metallurgical industry, the method saves the processes of intermediate cooling and reheating, not only effectively saves the capital investment, but also greatly reduces the energy consumption and the environmental pollution.
In the existing laboratory simulation twin-roll thin strip continuous casting technology, the cooling conditions of the solidification process and the cooling process cannot be accurately controlled according to the requirements on the room temperature structure, the grain size and the like of the sample, and high-throughput sample measurement research is carried out.
The solidification process is generally carried out at high temperatures, which is not easily observable. In recent years, numerical simulation technology is used for simulating the solidification process, various process parameters are modified in a virtual environment, and the change rule is observed and summarized, so that the method plays a role in guiding actual production.
Disclosure of Invention
The invention aims to provide a sub-rapid solidification-control cooling-control high-flux heat simulation testing machine and a testing method, which are combined with a ProCAST simulation temperature field to realize that the cooling conditions of a solidification process and a quenching process are simultaneously controlled in a laboratory simulation twin-roll thin strip continuous casting process so as to obtain an expected room temperature structure.
In order to achieve these objects and other advantages, according to the present invention, a sub-rapid solidification-control high-throughput thermal simulation testing machine is provided, which includes a moving device, a heating device, a molten metal bath, a cooling device, a plurality of samplers, and a plurality of first lifting mechanisms corresponding to the samplers in equal number one to one, wherein the molten metal bath is disposed inside the heating device, the cooling device is disposed on the molten metal bath, a plurality of cooling liquid barrels with openings at upper ends corresponding to the samplers in equal number one to one are disposed on the cooling device, the samplers are in transmission connection with the moving device through the corresponding first lifting mechanisms, and the moving device can drive the samplers to move back and forth between the molten metal bath and the corresponding cooling liquid barrels.
Preferably, in the sub-rapid controlled-freezing controlled-cooling high-flux thermal simulation testing machine, the cooling device comprises a cooling rack, and a plurality of cooling liquid barrels are arranged on the cooling rack at left and right intervals.
Preferably, in the sub-rapid controlled-freezing controlled-cooling high-flux thermal simulation testing machine, the heating device comprises a heating furnace with an opening at the upper end and a furnace cover capable of opening or closing the opening at the upper end of the heating furnace, and the molten metal pool is horizontally arranged in the heating furnace.
Preferably, a sub-fast accuse congeals accuse cold high flux thermal simulation testing machine in, the mobile device includes support, horizontal rotation mechanism, dwang and horizontal telescopic machanism, the support sets up one side of heating device and cooling device, the dwang level sets up, and its one end is in with the setting on the support horizontal rotation mechanism transmission is connected, horizontal telescopic machanism sets up on the dwang, it is a plurality of the sampler all sets up horizontal telescopic machanism below to through corresponding first elevating system with horizontal telescopic machanism transmission is connected.
Preferably, a sub-rapid accuse congeals accuse cold high flux thermal simulation testing machine in, horizontal telescopic machanism includes telescoping cylinder, horizon bar and spacing ring, the telescoping cylinder sets up on the dwang, and its telescopic link is followed the direction setting of dwang, the horizon bar with the telescopic link coaxial coupling of telescoping cylinder, the spacing ring cover is established on the dwang, and the horizon bar passes the spacing ring and rather than sliding connection.
Preferably, in the sub-rapid controlled-freezing controlled-cooling high-flux thermal simulation testing machine, the bracket is further provided with a second lifting mechanism, and the horizontal rotating mechanism is arranged above the second lifting mechanism and is in transmission connection with the second lifting mechanism.
The invention also provides a sub-rapid solidification-control high-flux thermal simulation test method, which adopts any one of the sub-rapid solidification-control high-flux thermal simulation test machines and comprises the following steps:
s1, simulating a temperature field of a component casting of the molten steel in the cooling process through ProCAST according to the components of the molten steel in the molten metal bath, and determining the thickness of a cooling wall of each sampler in the sampler according to the requirements on the surface structure of the sample;
s2, the moving device drives the samplers to rotate above the molten metal pool, then the first lifting mechanisms respectively drive the corresponding samplers to descend into molten steel immersed in the molten metal pool, and sampling is completed after 2-3S;
s3, after the sampling is completed, the first lifting mechanism respectively drives the corresponding sampler to ascend to the top of the cooling mechanism, and then the moving device first drives the sampler to ascend to the cooling device, and then drives the sampler to rotate to the top of the corresponding cooling liquid barrel, and then the first lifting mechanism respectively drives the corresponding sampler to descend to be immersed in the cooling liquid in the corresponding cooling liquid barrel, wherein the cooling liquid in each cooling liquid barrel is the same;
and S4, after cooling for a period of time, synchronously driving the corresponding sampler to ascend to the upper part of the cooling device by the aid of the first lifting mechanisms, and taking out the casting sample in the sampler after the sampler is cooled to room temperature.
Preferably, in the method for simulating the high-flux heat simulation for the sub-rapid solidification control, the number of the samplers is three, and the thicknesses of the cooling walls of the three samplers are 5mm, 9mm and 13mm respectively.
The invention also provides a sub-rapid controlled-cooling high-flux thermal simulation test method, which adopts any one of the sub-rapid controlled-freezing high-flux thermal simulation test machines and comprises the following steps:
s1, simulating a temperature field of a molten steel component casting in a cooling process through ProCAST according to the components of the molten steel in the molten metal bath, and selecting different water cooling time intervals and cooling liquid components according to the requirements on the cooling rate and the average grain size of a room temperature structure in a solid phase transition process;
s2, dividing the cooling liquid barrels into at least two groups, wherein the cooling liquid in each group of cooling liquid barrels is different;
simultaneously determining the cooling time corresponding to each cooling liquid barrel in each group of cooling liquid barrels;
s3, after sampling, the first lifting mechanisms respectively drive the corresponding samplers to ascend to the upper part of the cooling mechanism, then the moving device firstly drives the samplers to ascend to the cooling device, then drives the samplers to rotate to the upper part of the corresponding cooling liquid barrel, and then the first lifting mechanisms respectively drive the corresponding samplers to descend to be immersed into the cooling liquid in the corresponding cooling liquid barrel;
and S4, after the cooling time corresponding to the cooling liquid barrel is up, the corresponding first lifting mechanism drives the corresponding sampler to ascend to the upper part of the cooling device, and the casting sample in the sampler can be taken out after the sampler is cooled to the room temperature.
Preferably, in the sub-rapid cooling control high-flux thermal simulation test method, the cooling liquid barrels are divided into two groups, and the cooling liquids in the two groups of cooling liquid barrels are water and water-based quenching liquid respectively.
The invention has the beneficial effects that:
(1) the sub-rapid solidification-control cooling-control high-flux thermal simulation testing machine is based on sub-rapid double-roller thin-strip continuous casting, accurate simulation is carried out on the sub-rapid solidification-control cooling-control high-flux thermal simulation testing machine, and labor cost and time cost are greatly reduced.
(2) The sub-rapid solidification-control cooling-control high-flux thermal simulation testing machine provided by the invention realizes high-flux sampling, contrasts and samples under different solidification conditions and cooling conditions, and minimizes the influence of environmental temperature, manual sampling errors and the like on sample preparation.
(3) The invention relates to a sub-rapid solidification-control high-flux thermal simulation test method, which simulates the temperature field of the alloy component casting in the solidification process through ProCAST, and selects copper molds with different cooling capacities according to the requirements on the surface structure of a sample so as to control the cooling rate in the solidification process.
(4) The invention relates to a sub-rapid cooling control high-flux thermal simulation test method, which simulates the temperature field of the alloy component casting in the cooling process through ProCAST, and selects different water cooling time intervals and quenching media according to the requirements on the cooling rate and the average grain size of a room temperature structure in the solid phase transition process so as to control the cooling rate in the cooling process.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of a sub-rapid controlled-setting controlled-cooling high-flux thermal simulation testing machine according to the present invention;
FIG. 2 is a graph showing the cooling rate variation in the solidification region at different positions of a sample in a copper mold having different thicknesses according to an embodiment of the present invention;
FIG. 3 is a graph showing the relationship between the amount of inclusions on the surface of copper mold samples of different thicknesses and the cooling rate in the solidification region according to an embodiment of the present invention;
FIG. 4 is a continuous transition temperature profile of twin roll strip cast low carbon steel in accordance with another embodiment of the present invention;
FIG. 5 is a graph illustrating the effect of gamma-alpha transition average cooling rate on PF grain size in another embodiment of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, an embodiment of the present invention provides a sub-rapid solidification-control high-flux thermal simulation testing machine, which includes a moving device, a heating device, a molten metal bath 1, a cooling device, a plurality of samplers 2, and a plurality of first lifting mechanisms 3 with the same number as the samplers 2 and corresponding to the samplers one to one, the molten metal bath 1 is arranged inside a heating device, the cooling device is arranged on the molten metal bath 1, the cooling device comprises a cooling frame 5, a plurality of cooling liquid barrels 4 with openings at the upper ends, which are equal to the samplers 2 in number and correspond one to one, are arranged on the cooling rack 5 at intervals from left to right, the samplers 2 are in transmission connection with the mobile device through corresponding first lifting mechanisms 3, the moving device can drive the sampler 2 to move back and forth between the molten metal bath 1 and the corresponding cooling liquid barrel 4.
In the embodiment, a plurality of samplers 2 are driven by a moving device to a molten metal bath 1 and a cooling liquid barrel 4, so that an empty sampler 2 is moved to molten steel in the molten metal bath 1 for sampling, then the sampled sampler 2 is moved to the corresponding cooling liquid barrel 4, and the sampler 2 and the sample therein are cooled by cooling liquid in the cooling liquid barrel 4. The cooling walls of the sampler 2 are typically copper, so that the cooling liquid in different cooling liquid tanks 4 can be made of different materials by setting the thickness of the cooling walls of different samplers 2 to be different. In order to realize different cooling time of different samplers 2 in the corresponding cooling liquid barrels 4, the samplers 2 are in transmission connection with the moving device through the first lifting mechanisms 3, so that the cooling time of the samplers 2 can be controlled through the first lifting mechanisms 3 corresponding to the samplers 2. Specifically, as one embodiment, the heating device comprises a heating furnace 6 with an opening at the upper end and a furnace cover 7 capable of opening or closing the opening at the upper end of the heating furnace 6, a mold powder 61 is arranged in the heating furnace 6, a plurality of heating bodies 62 are further arranged in the mold powder 61, the plurality of heating bodies 62 are arranged in the heating furnace 6 in a circle, and the molten metal pool 1 is horizontally arranged in the heating furnace 6; the mobile device includes support 8, horizontal rotation mechanism 9, dwang 10 and horizontal telescopic machanism, support 8 sets up one side of heating device and cooling device, dwang 10 level sets up, and its one end is in with the setting on the support 8 horizontal rotation mechanism 9 transmission is connected, horizontal telescopic machanism sets up on the dwang 10, it is a plurality of sampler 2 all sets up horizontal telescopic machanism below to through corresponding first elevating system 3 with horizontal telescopic machanism transmission is connected.
Preferably, as another embodiment of the present invention, the horizontal telescopic mechanism includes a telescopic cylinder 11, a horizontal rod 12 and a limiting ring 13, the telescopic cylinder 11 is disposed on the rotating rod 10, and the telescopic rod thereof is disposed along the direction of the rotating rod 10, the horizontal rod 12 is coaxially connected with the telescopic rod of the telescopic cylinder 11, the limiting ring 13 is sleeved on the rotating rod 10, and the horizontal rod 12 passes through the limiting ring 13 and is slidably connected therewith.
In this embodiment, the telescopic cylinder 11 is connected with one end of the horizontal rod 12, the telescopic rod of the telescopic cylinder drives the horizontal rod 12 to move horizontally, the other end of the horizontal rod 12 can slide to pass through the limiting ring 13, and the horizontal rod 12 can be guaranteed to be always kept horizontal when the telescopic rod drives the horizontal rod 12 to move.
Preferably, as another embodiment of the present invention, a second lifting mechanism 14 is further disposed on the bracket 8, and the horizontal rotation mechanism 9 is disposed above the second lifting mechanism 14 and is in transmission connection therewith.
In this embodiment, by providing the second elevating mechanism 14, the height of the rotating lever 10 can be adjusted according to the heights of the coolant tank 4 and the molten metal bath 1.
In addition, on the basis of the embodiment shown in fig. 1, as shown in fig. 2 to fig. 3, the invention further provides a sub-rapid solidification-controlled high-flux thermal simulation test method, which adopts any one of the above-mentioned sub-rapid solidification-controlled high-flux thermal simulation test machines, and comprises the following steps:
s1, simulating a temperature field of a component casting of the molten steel in the cooling process through ProCAST according to the components of the molten steel in the molten metal bath 1, and determining the thickness of a cooling wall of each sampler 2 in the sampler 2 according to the requirements on the surface structure of a sample;
wherein the molten steel of the molten metal bath 1 has the following chemical composition in weight percent:
C：0.02-0.05％；
Mn：0.06-0.08％；
Si：0.2-0.4％；
Ti≤0.03％；
Al：≤0.04％；
Cu：≤0.01％；
Ni：≤0.06％；
S：≤0.01％；
the balance of Fe and inevitable impurity elements;
in this embodiment, three samplers 2 are provided, and the thicknesses of the cooling walls of the three samplers 2 are 5mm, 9mm and 13mm, respectively;
s2, the moving device drives the sampler 2 to rotate above the molten metal pool 1, then the first lifting mechanism 3 respectively drives the corresponding sampler 2 to descend into the molten steel immersed in the molten metal pool 1, and sampling is completed after 2-3S;
s3, after the sampling is completed, the first lifting mechanism 3 drives the corresponding sampler 2 to lift above the cooling mechanism, the moving device drives the sampler 2 to lift above the cooling device, then drives the sampler 2 to rotate above the corresponding cooling liquid barrel 4, and then the first lifting mechanism 3 drives the corresponding sampler 2 to lift down to the cooling liquid immersed in the corresponding cooling liquid barrel 4, wherein the cooling liquid in the cooling liquid barrels 4 is the same;
and S4, after cooling for a period of time, the plurality of first lifting mechanisms 3 synchronously drive the corresponding sampler 2 to ascend to the upper part of the cooling device, and the casting sample in the sampler 2 can be taken out after the sampler is cooled to the room temperature.
In this embodiment, the solidification process is generally performed at a high temperature, which is not easily observed. In recent years, numerical simulation technology is used for simulating the solidification process, various process parameters are modified in a virtual environment, and the change rule is observed and summarized, so that the method plays a role in guiding actual production.
The calculation was simulated using ESI ProCAST 2018 software. A mathematical model is established on the basis of reasonable assumption and simplification of the continuous casting slab solidification heat transfer process, and the temperature field of the low-carbon steel sheet in the sub-rapid solidification process is simulated and calculated.
The heat transfer direction of the sheet is divided into three directions, namely a suction casting direction, a width direction and a thickness direction. The heat transfer quantity along the suction casting direction is small, the width of the thin slice is far larger than the thickness, the temperature gradient in the width direction is small, the heat transfer in the direction can be ignored, and a one-dimensional heat transfer model in the thickness direction is established.
Setting simulated initial temperature according to molten steel, a copper mold and an external environment, determining heat exchange coefficients of the copper mold and the molten steel and the copper mold and the environment by referring to a heat exchange coefficient database of ProCAST and related contents of twin-roll strip casting, and calculating thermophysical parameters through an empirical formula.
The simulation process of the sample temperature field by using the ProCAST can be simply divided into three steps: the first step is to import the drawn physical model, the second step is to input the calculated thermophysical property parameters of the low-carbon steel, set initial conditions and boundary conditions, and finally set calculation parameters; and thirdly, checking the calculation result, and exporting data for processing and analysis according to the requirement.
Specifically, a sub-rapid solidification-control high-flux heat simulation test is carried out through a sub-rapid solidification-control cooling high-flux heat simulation testing machine: the cooling speed of the sample in the solidification process is controlled by adjusting the thickness of the copper mold cooling wall, and the final structure is influenced. Specifically, a heat transfer model is constructed in ProCAST according to the components of molten steel, and the curve of the cooling rate of the sample in the solidification process along with time is shown in figure 2 when the thickness of a simulated copper mold is 5mm, 9mm and 13mm and the thickness of the sample is 3 mm. When the thickness of the copper mold is 5mm, 9mm and 13mm respectively, the surface cooling rate of the sample is 907K/s, 960K/s and 974K/s respectively, and the internal cooling rate tends to be consistent. The thickness of the copper mold is increased, the temperature difference between the surface of the sample and the center of the sample is increased, and the cooling speed of a solidification interval of the surface position is promoted.
Most inclusions in the thin strip continuous casting steel are generated in the molten steel solidification process, the larger the cooling speed in the solidification zone is, the smaller the size and the larger the quantity of the inclusions precipitated in the steel are, the more uniform the distribution is, and the inclusions in the range of 0.5-0.7 mu m are more beneficial to generating acicular ferrite structures in the thin strip cast low-carbon steel. FIG. 3 is a graph showing the relationship between the number density of inclusions having a size of 0.5 to 0.7 μm at the surface position and the cooling rate in the solidification region in different samples, which is consistent with the tendency of the cooling rate in the solidification region at the surface position.
In addition, on the basis of the embodiment shown in fig. 1, as shown in fig. 3 to 4, the invention further provides a sub-rapid controlled-freezing high-flux thermal simulation test method, which adopts any one of the above-mentioned sub-rapid controlled-freezing high-flux thermal simulation test machines, and comprises the following steps:
s1, simulating a temperature field of a molten steel component casting in a cooling process through ProCAST according to the components of the molten steel in the molten metal bath 1, and selecting different water cooling time intervals and cooling liquid components according to the requirements on the cooling rate and the average grain size of a room temperature structure in a solid phase transition process;
wherein the molten steel of the molten metal bath 1 has the following chemical composition in weight percent:
C：0.02-0.05％；
Mn：0.06-0.08％；
Si：0.2-0.4％；
Ti≤0.03％；
Al：≤0.04％；
Cu：≤0.01％；
Ni：≤0.06％；
S：≤0.01％；
the balance of Fe and inevitable impurity elements;
and S2, dividing the cooling liquid barrels 4 into two groups, wherein the cooling liquids in the two groups of cooling liquid barrels 4 are water and water-based quenching liquid respectively. (ii) a
Simultaneously determining the cooling time corresponding to each cooling liquid barrel 4 in each group of cooling liquid barrels 4;
s3, after the sampling is completed, the first lifting mechanism 3 drives the corresponding sampler 2 to rise above the cooling mechanism, and then the moving device drives the sampler 2 to rise above the cooling device, and then drives the sampler 2 to rotate above the corresponding cooling liquid barrel 4, and then the first lifting mechanism 3 drives the corresponding sampler 2 to fall into the cooling liquid immersed in the corresponding cooling liquid barrel 4;
and S4, after the cooling time corresponding to the cooling liquid barrel 4 is up, the corresponding first lifting mechanism 3 drives the corresponding sampler 2 to be lifted to the upper part of the cooling device, and the casting sample in the sampler 2 can be taken out after the sampler 2 is cooled to the room temperature.
In this embodiment, a sub-rapid cooling-control high-flux heat simulation test is performed by a sub-rapid cooling-control high-flux heat simulation testing machine: the cooling speed of the sample in the solidification process is controlled by adjusting the thickness of the copper mold cooling wall, and the final structure is influenced.
The continuous transition temperature profile of twin roll strip cast low carbon steel (C0.032 wt.%, Mn 0.686 wt.%, Si 0.18 wt.%, Cu 0.07 wt.%, Cr 0.041 wt.%) is shown in fig. 4, where bainite begins to transition (B)S) 1020K, polygonal ferrite (alpha) is formedp) Quasi-polygonal ferrite (alpha)q) The temperature and the cooling speed range are 1080-950K and 1-30K/s respectively; form granular bainitic ferrite (alpha)B) The temperature and the cooling rate range are 960-785K and 1-45K/s respectively; form lathy bainitic ferrite (alpha DEG)B) The temperature and the cooling rate range are 960-883K and 20-100K/s respectively; the temperature and cooling rate for forming Acicular Ferrite (AF) are respectively 897-753K and 24-100K/s. According to the prediction of the ProCAST simulation result, when the water cooling time interval is 25s, the structures which can be formed by the low-carbon steel in the copper dies of 5mm, 9mm and 13mm are PF, QF, AF, BF and GB.
The average cooling rate of gamma-alpha transformation is increased along with the thickness of the copper mould, and the average cooling rate also has influence on the grain size of the PF. As shown in FIG. 5, when the average cooling rate of Ar3-Ar1 is increased from 23K/s to 43K/s, the PF grain size is reduced from 129 μm to 60 μm, and then is increased to 52K/s, and the PF grain size is reduced to 41 μm, which shows that when the average cooling rate of gamma-alpha conversion is increased to a certain value, the microstructure of the low-carbon steel has certain refining capacity.
In addition, because the sampler in this application drives its lift through independent elevating system, so the subfast accuse congeals accuse cold high flux heat analogue test machine of this application can carry out subfast accuse cold high flux heat analogue test and subfast accuse cold high flux heat analogue test simultaneously through the quantity that increases the sampler.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (10)
1. A sub-rapid solidification-control high-flux thermal simulation testing machine is characterized by comprising a moving device, a heating device, a metal melting pool (1), a cooling device, a plurality of samplers (2) and a plurality of first lifting mechanisms (3) which are equal in number to the samplers (2) and correspond to the samplers one by one, the molten metal pool (1) is arranged at the inner side of the heating device, the cooling device is arranged on the molten metal pool (1), the cooling device is provided with a plurality of cooling liquid barrels (4) with upper end openings, the number of the cooling liquid barrels is equal to that of the samplers (2), the upper end openings correspond to the samplers one by one, the samplers (2) are in transmission connection with the moving device through the corresponding first lifting mechanisms (3), the moving device can drive the sampler (2) to move back and forth between the metal melting pool (1) and the corresponding cooling liquid barrel (4).
2. The testing machine for sub-rapid controlled-freezing high-flux thermal simulation according to claim 1, wherein the cooling device comprises a cooling rack (5), and a plurality of cooling liquid buckets (4) are arranged on the cooling rack (5) at intervals from left to right.
3. The machine according to claim 2, wherein the heating means comprises a furnace (6) with an open upper end and a furnace cover (7) for opening or closing the open upper end of the furnace (6), and the molten metal bath (1) is horizontally disposed in the furnace (6).
4. The testing machine for sub-rapid controlled condensation and high-flux thermal simulation according to claim 3, wherein the moving device comprises a support (8), a horizontal rotating mechanism (9), a rotating rod (10) and a horizontal telescoping mechanism, the support (8) is disposed at one side of the heating device and the cooling device, the rotating rod (10) is horizontally disposed, one end of the rotating rod is in transmission connection with the horizontal rotating mechanism (9) disposed on the support (8), the horizontal telescoping mechanism is disposed on the rotating rod (10), and the plurality of samplers (2) are disposed below the horizontal telescoping mechanism and are in transmission connection with the horizontal telescoping mechanism through the corresponding first lifting mechanism (3).
5. The testing machine of claim 4, wherein the horizontal telescoping mechanism comprises a telescoping cylinder (11), a horizontal rod (12) and a limiting ring (13), the telescoping cylinder (11) is disposed on the rotating rod (10), and the telescopic rod of the telescoping cylinder is disposed along the direction of the rotating rod (10), the horizontal rod (12) is coaxially connected with the telescopic rod of the telescoping cylinder (11), the limiting ring (13) is sleeved on the rotating rod (10), and the horizontal rod (12) passes through the limiting ring (13) and is slidably connected with the limiting ring (13).
6. The testing machine for sub-rapid controlled-freezing controlled-cooling high-flux thermal simulation according to claim 4, wherein a second lifting mechanism (14) is further arranged on the bracket (8), and the horizontal rotating mechanism (9) is arranged above the second lifting mechanism (14) and is in transmission connection with the second lifting mechanism.
7. A sub-rapid controlled-setting high-flux thermal simulation test method, which adopts the sub-rapid controlled-setting high-flux thermal simulation test machine as claimed in any one of claims 1 to 6, and is characterized by comprising the following steps:
s1, simulating a temperature field of a component casting cooling process of the molten steel through ProCAST according to the components of the molten steel in the molten metal bath (1), and determining the thickness of a cooling wall of each sampler (2) in the sampler (2) according to the requirements on the surface structure of the sample;
s2, the moving device drives the sampler (2) to rotate above the molten metal pool (1), then the first lifting mechanism (3) respectively drives the corresponding sampler (2) to descend into molten steel immersed in the molten metal pool (1), and sampling is completed after 2-3S;
s3, after sampling, the first lifting mechanism (3) respectively drives the corresponding sampler (2) to ascend to the upper part of the cooling mechanism, then the moving device firstly drives the sampler (2) to ascend to the cooling device, then drives the sampler (2) to rotate to the upper part of the corresponding cooling liquid barrel (4), and then the first lifting mechanism (3) respectively drives the corresponding sampler (2) to descend to be immersed into the cooling liquid in the corresponding cooling liquid barrel (4), wherein the cooling liquid in each cooling liquid barrel (4) is the same;
s4, after one end of cooling time, the first lifting mechanisms (3) synchronously drive the corresponding samplers (2) to ascend to the upper part of the cooling device, and casting samples in the samplers (2) can be taken out after the samplers (2) are cooled to room temperature.
8. The method for the simulation test of the sub-rapid solidification high-flux heat according to claim 7, wherein the number of the samplers (2) is three, and the thicknesses of the cooling walls of the three samplers (2) are 5mm, 9mm and 13mm respectively.
9. A sub-rapid controlled-cooling high-flux thermal simulation test method, which adopts the sub-rapid controlled-freezing high-flux thermal simulation test machine as claimed in any one of claims 1 to 6, and is characterized by comprising the following steps:
s1, simulating a temperature field of a molten steel component casting in a cooling process through ProCAST according to the components of the molten steel in the molten metal bath (1), and selecting different water cooling time intervals and cooling liquid components according to the requirements on the cooling rate and the average grain size of a room temperature structure in a solid phase transition process;
s2, dividing the cooling liquid barrels (4) into at least two groups, wherein the cooling liquid in each group of cooling liquid barrels (4) is different;
simultaneously determining the cooling time corresponding to each cooling liquid barrel (4) in each group of cooling liquid barrels (4);
s3, after sampling, the first lifting mechanisms (3) respectively drive the corresponding samplers (2) to ascend to the upper part of the cooling mechanism, the moving devices firstly drive the samplers (2) to ascend to the cooling device, then drive the samplers (2) to rotate to the upper part of the corresponding cooling liquid barrels (4), and then the first lifting mechanisms (3) respectively drive the corresponding samplers (2) to descend to be immersed into the cooling liquid in the corresponding cooling liquid barrels (4);
s4, after the cooling time corresponding to the cooling liquid barrel (4) is up, the corresponding first lifting mechanism (3) drives the corresponding sampler (2) to ascend to the upper part of the cooling device, and the casting sample in the sampler (2) can be taken out after the sampler (2) is cooled to the room temperature.
10. The method for the simulation test of sub-rapid cooling control and high flux heat according to claim 9, wherein the cooling liquid barrels (4) are divided into two groups, and the cooling liquid in the two groups of cooling liquid barrels (4) is water and water-based quenching liquid respectively.
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| US5949000A (en) * | 1995-01-27 | 1999-09-07 | Sintercast Ab | Sampling device for use in performing thermal analysis of solidifying metal |
| CN201780214U (en) * | 2010-08-17 | 2011-03-30 | 田陆 | Sampler for continuous casting solidification simulation experiment |
| CN105973664A (en) * | 2016-05-05 | 2016-09-28 | 上海大学 | Solidified sample high-flux preparation method |
| CN111351357A (en) * | 2020-02-19 | 2020-06-30 | 哈尔滨工业大学 | High-flux preparation device and method for metal matrix composite |
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- 2021-07-16 CN CN202110804164.XA patent/CN113533412A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5949000A (en) * | 1995-01-27 | 1999-09-07 | Sintercast Ab | Sampling device for use in performing thermal analysis of solidifying metal |
| CN201780214U (en) * | 2010-08-17 | 2011-03-30 | 田陆 | Sampler for continuous casting solidification simulation experiment |
| CN105973664A (en) * | 2016-05-05 | 2016-09-28 | 上海大学 | Solidified sample high-flux preparation method |
| CN111351357A (en) * | 2020-02-19 | 2020-06-30 | 哈尔滨工业大学 | High-flux preparation device and method for metal matrix composite |
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